How to Build and test API requests

Build and test API requests in your browser. Construct HTTP requests with a visual interface, send them via Fetch API, and view formatted responses.

4 min read API Request Builder Free, no signup required

Quick start

API Request Builder — Build and test API requests in your browser.

Get started in under two minutes:

Configure your settings
Review and adjust settings
Review the output
Copy the result

Open API Request Builder

Step-by-step instructions

Follow these steps to get the best results from API Request Builder:

Configure your settings

Use the controls to set up what you want to generate. Set your preferences before generating.

Tip: Start with the default settings and refine from there.

Review and adjust settings

Use the settings panel to refine the output. API Request Builder lets you and test api requests in your browser.

Tip: Most settings work well at their defaults — only adjust when you need specific output.

Review the output

Check the result against what you expected. Look for any errors or unexpected output.

Tip: You can experiment freely — nothing is saved or sent anywhere until you download or copy.

Copy the result

Click the "Copy" button to copy the output to your clipboard. The button briefly changes to "Copied!" to confirm the action.

Tip: Paste the result directly into your project, code editor, or document.

Open API Request Builder

Frequently asked questions

Are my data uploaded to a server?

No. API Request Builder processes everything locally in your browser using JavaScript. Your data never leave your device, making it safe for confidential or sensitive content.

Is API Request Builder free to use?

Yes — API Request Builder is completely free with no account or signup required. All core features are available immediately.

Does API Request Builder work on mobile devices?

Yes — API Request Builder works on smartphones and tablets through any modern mobile browser. The interface adapts to smaller screens automatically.